<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
</head>
<body>
    <style type="text/css">
    	html,body{
			width: 100%;
			height: 100%;
			margin: 0;
			padding: 0;
		}
		canvas{
			width: 100%;
			height: 100%;
		}
    </style>
    <canvas id="canvas" class="canvas"></canvas>
    <script src="bg.js"></script>
</body>
</html>